Hi folks,
Does the nmi_watchdog prevent libpfm from working at all? I’m on an older
Sandia system (compton)
Is this a kernel version and perf attr data structure problem? It can’t be NMI
since perf with raw registers seems to work fine…
ideas? This also affected PAPI.
Phil
[pjmucci@compton1 perfmon2-libpfm4.git]$ uname -a
Linux compton1 2.6.32-131.0.15.el6.x86_64 #1 SMP Tue May 10 15:42:40 EDT 2011
x86_64 x86_64 x86_64 GNU/Linux
[pjmucci@compton1 perfmon2-libpfm4.git]$ cat /etc/*ease
Red Hat Enterprise Linux Workstation release 6.1 (Santiago)
Red Hat Enterprise Linux Workstation release 6.1 (Santiago)
[pjmucci@compton32 perfmon2-libpfm4.git]$ cat /etc/*ease
Red Hat Enterprise Linux Server release 6.2 (Santiago)
Red Hat Enterprise Linux Server release 6.2 (Santiago)
[pjmucci@compton32 perfmon2-libpfm4.git]$ uname -a
Linux compton32 2.6.32-220.el6.x86_64 #1 SMP Wed Nov 9 08:03:13 EST 2011 x86_64
x86_64 x86_64 GNU/Linux
[pjmucci@compton32 perfmon2-libpfm4.git]$ cat
/proc/sys/kernel/perf_event_paranoid
2
[pjmucci@compton32 perfmon2-libpfm4.git]$ cat /proc/sys/kernel/nmi_watchdog
1
[pjmucci@compton32 perfmon2-libpfm4.git]$ ./examples/check_events
snb_ep::UOPS_RETIRED:TOTAL_CYCLES:u
Requested Event: snb_ep::UOPS_RETIRED:TOTAL_CYCLES:u
Actual Event: snb_ep::UOPS_RETIRED:ALL:k=0:u=1:e=0:i=0:c=16:t=0
PMU : Intel Sandy Bridge EP
IDX : 148897869
Codes : 0x105101c2
[pjmucci@compton32 perfmon2-libpfm4.git]$ perf stat -e r105301c2:uh sleep 1
Performance counter stats for 'sleep 1':
0 r105301c2:uh
1.001672975 seconds time elapsed
[pjmucci@compton32 perfmon2-libpfm4.git]$ ./perf_examples/self_count
snb_ep::UOPS_RETIRED:TOTAL_CYCLES:u
self_count: cannot open event 0: Invalid argument
[pjmucci@compton32 perfmon2-libpfm4.git]$ ./perf_examples/evt2raw
snb_ep::UNHALTED_CORE_CYCLES:u
r53003c:uh
[pjmucci@compton32 perfmon2-libpfm4.git]$ ./perf_examples/evt2raw
snb_ep::UNHALTED_REFERENCE_CYCLES:u
r530300:uh
[pjmucci@compton32 perfmon2-libpfm4.git]$ perf stat -e r530300:uh sleep 1
Performance counter stats for 'sleep 1':
3 r530300:uh
1.002638998 seconds time elapsed
[pjmucci@compton32 perfmon2-libpfm4.git]$ perf stat -e r53003c:uh sleep 1
Performance counter stats for 'sleep 1':
300,065 r53003c:uh
1.001350589 seconds time elapsed
[pjmucci@compton32 perfmon2-libpfm4.git]$ ./perf_examples/self_count
snb_ep::UNHALTED_CORE_CYCLES:u
self_count: cannot open event 0: Invalid argument
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